linux-kernel - [PATCH AUTOSEL 5.10 118/176] iomap: pass writeback errors to the mapping

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Date:   Thu,  9 Sep 2021 07:50:20 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Darrick J. Wong" <djwong@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Sasha Levin <sashal@...nel.org>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 118/176] iomap: pass writeback errors to the mapping

From: "Darrick J. Wong" <djwong@...nel.org>

[ Upstream commit b69eea82d37d9ee7cfb3bf05103549dd4ed5ffc3 ]

Modern-day mapping_set_error has the ability to squash the usual
negative error code into something appropriate for long-term storage in
a struct address_space -- ENOSPC becomes AS_ENOSPC, and everything else
becomes EIO.  iomap squashes /everything/ to EIO, just as XFS did before
that, but this doesn't make sense.

Fix this by making it so that we can pass ENOSPC to userspace when
writeback fails due to space problems.

Signed-off-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/iomap/buffered-io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 10cc7979ce38..caed9d98c64a 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1045,7 +1045,7 @@ iomap_finish_page_writeback(struct inode *inode, struct page *page,
 
 	if (error) {
 		SetPageError(page);
-		mapping_set_error(inode->i_mapping, -EIO);
+		mapping_set_error(inode->i_mapping, error);
 	}
 
 	WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop);
-- 
2.30.2